package com.ruoyi.framework.web.service;

import javax.annotation.Resource;

import com.ruoyi.common.exception.user.*;
import com.ruoyi.common.utils.uuid.UUID;
import com.ruoyi.face.dto.FaceRecognitionResDTO;
import com.ruoyi.face.service.FaceLoginService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Component;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.constant.UserConstants;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.core.domain.model.LoginUser;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.MessageUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.ip.IpUtils;
import com.ruoyi.framework.manager.AsyncManager;
import com.ruoyi.framework.manager.factory.AsyncFactory;
import com.ruoyi.framework.security.context.AuthenticationContextHolder;
import com.ruoyi.system.service.ISysConfigService;
import com.ruoyi.system.service.ISysUserService;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 登录校验方法
 *
 * @author ruoyi
 */
@Component
public class SysLoginService {
    @Autowired
    private TokenService tokenService;

    @Resource
    private AuthenticationManager authenticationManager;

    @Autowired
    private RedisCache redisCache;

    @Autowired
    private ISysUserService userService;

    @Autowired
    private ISysConfigService configService;
    @Autowired
    private FaceLoginService faceLoginService;
    @Autowired
    private SysPermissionService sysPermissionService;

    /**
     * 登录验证
     *
     * @param username 用户名
     * @param password 密码
     * @param code     验证码
     * @param uuid     唯一标识
     * @return 结果
     */
    public String login(String username, String password, String code, String uuid) {
        // 验证码校验
        validateCaptcha(username, code, uuid);
        // 登录前置校验
        loginPreCheck(username, password);
        // 用户验证
        Authentication authentication = null;
        try {
            UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(username, password);
            AuthenticationContextHolder.setContext(authenticationToken);
            // 该方法会去调用UserDetailsServiceImpl.loadUserByUsername
            authentication = authenticationManager.authenticate(authenticationToken);
        } catch (Exception e) {
            if (e instanceof BadCredentialsException) {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
                throw new UserPasswordNotMatchException();
            } else {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, e.getMessage()));
                throw new ServiceException(e.getMessage());
            }
        } finally {
            AuthenticationContextHolder.clearContext();
        }
        AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_SUCCESS, MessageUtils.message("user.login.success")));
        LoginUser loginUser = (LoginUser) authentication.getPrincipal();
        recordLoginInfo(loginUser.getUserId());
        // 生成token
        return tokenService.createToken(loginUser);
    }

    /**
     * 校验验证码
     *
     * @param username 用户名
     * @param code     验证码
     * @param uuid     唯一标识
     */
    public void validateCaptcha(String username, String code, String uuid) {
        boolean captchaEnabled = configService.selectCaptchaEnabled();
        if (captchaEnabled) {
            String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + StringUtils.nvl(uuid, "");
            String captcha = redisCache.getCacheObject(verifyKey);
            if (captcha == null) {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.expire")));
                throw new CaptchaExpireException();
            }
            redisCache.deleteObject(verifyKey);
            if (!code.equalsIgnoreCase(captcha)) {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.error")));
                throw new CaptchaException();
            }
        }
    }

    /**
     * 登录前置校验
     *
     * @param username 用户名
     * @param password 用户密码
     */
    public void loginPreCheck(String username, String password) {
        // 用户名或密码为空 错误
        if (StringUtils.isEmpty(username) || StringUtils.isEmpty(password)) {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("not.null")));
            throw new UserNotExistsException();
        }
        // 密码如果不在指定范围内 错误
        if (password.length() < UserConstants.PASSWORD_MIN_LENGTH
                || password.length() > UserConstants.PASSWORD_MAX_LENGTH) {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
            throw new UserPasswordNotMatchException();
        }
        // 用户名不在指定范围内 错误
        if (username.length() < UserConstants.USERNAME_MIN_LENGTH
                || username.length() > UserConstants.USERNAME_MAX_LENGTH) {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
            throw new UserPasswordNotMatchException();
        }
        // IP黑名单校验
        String blackStr = configService.selectConfigByKey("sys.login.blackIPList");
        if (IpUtils.isMatchedIp(blackStr, IpUtils.getIpAddr())) {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("login.blocked")));
            throw new BlackListException();
        }
    }

    /**
     * 记录登录信息
     *
     * @param userId 用户ID
     */
    public void recordLoginInfo(Long userId) {
        SysUser sysUser = new SysUser();
        sysUser.setUserId(userId);
        sysUser.setLoginIp(IpUtils.getIpAddr());
        sysUser.setLoginDate(DateUtils.getNowDate());
        userService.updateUserProfile(sysUser);
    }

    public String faceLogin(String image) {
        FaceRecognitionResDTO faceRecognitionResDTO = faceLoginService.facelogin(image);
        if (faceRecognitionResDTO.getName() == null) {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor("", Constants.LOGIN_FAIL, MessageUtils.message("user.face.not.match")));
            throw new UserFaceNotMatchException();
        }
        SysUser sysUser = userService.selectUserByUserName(faceRecognitionResDTO.getName());
        LoginUser loginUser = new LoginUser(sysUser.getUserId(), sysUser.getDeptId(), sysUser, sysPermissionService.getMenuPermission(sysUser));
        recordLoginInfo(loginUser.getUserId());
        AsyncManager.me().execute(AsyncFactory.recordLogininfor("", Constants.LOGIN_SUCCESS, MessageUtils.message("user.face.login.success")));
        return tokenService.createToken(loginUser);
    }

    /**
     * 生成扫码登录二维码凭证
     *
     * @return 二维码凭证
     */
    public String generateScanCode() {
        String scanCode = UUID.randomUUID().toString();
        // 使用 RedisCache 存入二维码凭证，设置过期时间为 1 分钟
        Map<String, String> payload = new HashMap<>();
        payload.put("status", "pending");
        redisCache.setCacheObject(CacheConstants.SCAN_CODE_KEY + scanCode, payload, 3, TimeUnit.MINUTES);
        return scanCode;
    }

    /**
     * 处理扫码操作
     *
     * @param scanCode 二维码凭证
     */
    public void scanCode(String scanCode) {
        String key = CacheConstants.SCAN_CODE_KEY + scanCode;
        Map<String, String> payload = redisCache.getCacheObject(key);
        if (payload == null || !"pending".equals(payload.get("status"))) {
            throw new ServiceException("二维码已过期");
        }
        payload.put("status", "scanned");
        redisCache.setCacheObject(key, payload, 3, TimeUnit.MINUTES);
    }

    /**
     * 处理确认登录操作
     *
     * @param scanCode 二维码凭证,@param code token
     * @return 登录 token
     */
    public void confirmLogin(String scanCode, String code) {
        String key = CacheConstants.SCAN_CODE_KEY + scanCode;
        Map<String, String> payload = redisCache.getCacheObject(key);
        if (payload == null || !"scanned".equals(payload.get("status"))) {
            throw new ServiceException("二维码已过期");
        }
        LoginUser loginUser = tokenService.getLoginUser(code);
        payload.put("status", "logged");
        payload.put("token", tokenService.createToken(loginUser));
        redisCache.setCacheObject(key, payload, 3, TimeUnit.MINUTES);
        recordLoginInfo(loginUser.getUserId());
        AsyncManager.me().execute(AsyncFactory.recordLogininfor(loginUser.getUsername(), Constants.LOGIN_SUCCESS,MessageUtils.message("user.scan.login.success")));
    }

    /**
     * 查询扫码登录状态
     *
     * @param scanCode 二维码凭证
     * @return 登录状态或 token
     */
    public Object checkScanStatus(String scanCode) {
        String key = CacheConstants.SCAN_CODE_KEY + scanCode;
        Map<String, String> payload = redisCache.getCacheObject(key);
        if (payload == null) {
            throw new ServiceException("二维码已过期");
        }
        return payload;   // 直接返回 {"status":"...", "token":"..."}
    }
}
